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  • Extrusive Igneous Rocks: Types, Formation & Examples
    Igneous rocks that form on the Earth's surface are called extrusive igneous rocks. Here are some common examples:

    * Basalt: This is a dark-colored, fine-grained rock that is very common. It forms from the rapid cooling of lava flows.

    * Rhyolite: This is a light-colored, fine-grained rock that is rich in silica. It forms from the explosive eruptions of volcanoes.

    * Andesite: This is an intermediate-colored, fine-grained rock that is often found in volcanic arcs. It forms from the cooling of lava flows that have a higher silica content than basalt.

    * Obsidian: This is a dark, glassy rock that forms when lava cools very quickly. It is often found in volcanic flows and is used for tools and jewelry.

    * Pumice: This is a light, porous rock that forms from the rapid cooling of lava that is rich in gas. It is often used in gardening and as a scrubbing agent.

    These are just a few examples of the many types of extrusive igneous rocks that can be found on the Earth's surface. They are a fascinating reminder of the Earth's dynamic processes and the power of volcanoes.

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